Bahram I (Persian: بهرام‎ Bahrām) (also spelled Varahran or Vahram, r. 273–276) was the fourth Sassanid emperor of the second Persian Empire. He was the eldest son of Shapur I and succeeded his brother Hormizd I (r. 272–273), who had reigned for only a year.

The theophoric name Bahram comes from middle Persian Varahrän, 'victory', that is represented by the Zoroastrian divinity of the same name (see Vahram).

According to a Pahlavi inscription, Bahram I was the son (not, as the Greek historiographers and Tabari note, the grandson) of Shapur I (r. 241–272).

The earliest reference to Bahram I occurs in the coronation monument of Bahram's grandfather Ardeshir I at Naqsh-e Rajab. There, the future king appears as a smaller figure between Ardeshir and Ahura Mazda, and Bahram is seen bowing before the divinity after whom he is named. Similar iconography, such as the boar motifs in the seals and crown of Bahram, apparently reinforced the association with the yazata of victory.

Bahram died (apparently of disease) in 276. He was succeeded by his son who bore the same name and is known to history as Bahram II.

Hormizd I was the third Sassanid King of Persia from 270/72 to 273.

He was the youngest son of Shapur I (240–270/72), under whom he was governor of Khorasan, and appears in his wars against Rome (Historia Augusta, Trig. Tyr. 2, where Nöldeke has corrected the name Odomastes into Oromastes, i.e. Hormizd).

In the Persian tradition of the history of Ardashir I (226–240 [died 241/42]), preserved in a Pahlavi text (Nöldeke, Geschichte des Artachsir I. Papakan), Hormizd I is made the son of a daughter of Mithrak, a Persian dynast, whose family Ardashir had extirpated because the Magi had predicted that the restorer of the empire of Persia would come from his blood.

According to legend, this daughter alone was saved by a peasant; Shapur I saw her and made her his wife, and afterwards her son Hormizd I was recognized and acknowledged by Ardashir. In this legend, which has also been partially preserved in Tabari, the great conquests of Shapur I are transferred to Hormizd I. In reality he reigned only one year and ten days.